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1.2 Unifying Themes of Biology LEQ: What is the relationship between adaptation and natural selection? • Assignment: Reading 1.1-1.3 – Focus on: characteristics of life, themes of biology, hypotheses • Activator:..entangled bank.. – React to the following quote from Charles Darwin’s book On the Origin of Species. What are your views on the evolution of life? • Key terms: evolution, adaptation 1.2 Unifying Themes of Biology Evolution is change in living things over time. • Change: – genetic information – anatomy – development • Compare and contrast white oak (left) and red oak leaves (right) 1.2 Unifying Themes of Biology Evolution can occur through natural selection • Natural selection – advantageous traits – survival – reproductive success • Q: What environmental conditions favor the growth of evergreens more than deciduous trees? 1.2 Unifying Themes of Biology Adaptation involves changes in the traits of species • Top: coastal live oak – Close relative of red oaks • Bottom: southern live oak – Close relative of white oaks • Evergreen: adapting to poorer growing conditions – dryness – salt – sandy soils 1.2 Unifying Themes of Biology • New species can emerge when adaptive traits are passed on to future generations • Q: What are the characteristics of a tree? 1.2 Unifying Themes of Biology Adaptation: “racing for the sky” on islands • Prickly pear cactuses have evolved tree forms on the Galapagos Islands 1.2 Unifying Themes of Biology Adaptation: “racing for the sky” on islands • Cucumber plant relatives have evolved a tree form on Socotra 1.2 Unifying Themes of Biology Summary: • What is the relationship between evolution and natural selection? • Speculate: – Why have so many different types of tall woody plants evolved? – Why have so many different types of evergreens evolved? 1.2 Unifying Themes of Biology Summary: • How is the structure of a system (bone) related to how it functions? • Reflection: “No organ is an island” ~ Gerard Karsenty. In what way or for what reason would a bone need to be attuned to the rest of the body? • Closing: Describe how our class could be considered a system. 1.2 Unifying Themes of Biology Purple praying mantis: note the petal-like anatomy 1.2 Unifying Themes of Biology Orchids & predators 1.2 Unifying Themes of Biology 1.2 Unifying Themes of Biology Spiny Flower Mantis 1.2 Unifying Themes of Biology